When you create a light in Vectorworks you have the ability to change the colour. One of the settings is to use colour temperature. The colour temperature is physics concept that relates the colour of the light to the temperature of the surface radiating the light (in degrees Kelvin). In simple terms sunlight has a colour temperature of 5500. This is also known as daylight or cool light. For more information check out the manual 1601 Outdoor Lighting.